Skills are very simple:
20 points into tamohawk, throw mastery, shout, battle orders, iron skin
1 point into find item, summon, increase speed, splintershot, howl and battle command
rest into natural resistances for magic resist
Points into find item and splintershot can be saved for other things because i use ring with RIP - no corpse left. And i used splintershot almost never.
Not sure why you max dex ? Does it have synergies like median ? If not (which is probably true) then dex gives you AR and some defense. You better gamble rare barb throw weapon with AR and max dmg based on char level. Then minimum str for equipment and rest of points into vitality. 30k AR is more than enough and chars with 0 hp do no dmg
Gamble/find IK set gloves + helmet + boots + belt. Very good bonus on them all. And each part of set multiplies bonus, for example belt + 1 part = 8% DR, belt + 2 parts = 8% +8% DR. And so on. Plus belt can have random barb skill - try to find battle rage? - boost to dmg.